Combine should support observables

[hahn-kev]

I was a bit surprised to find that this doesn't work:

Observable<void> o;
auto all = combine() << o;

sure you can just call o.future() but it seems like that should be overloaded in combine.
Could this just be added to the Combinator?

    template <typename T>
    Combinator& operator<<(Observable<T> observable)
    {
        combinedFuture->addFuture(observable.future());
        return *this;
    }

[benlau]

Hi @hahn-kev ,

Should be a good idea. Will implement it when I am free.

Thx.

[benlau]

Added in master branch. Will release later

[benlau]

It is already released with 0.3.6.1